I just re-installed the air ride compressor after fixing it. I rehooked the battery and started my truck. Everything works fine except the Nav screen. It is black with just the "time" in small font. When I crank the truck the "cadillac" emblem doesnt come on either. The Onstar voice wont come on if I hit the button as well. What did I do to make this happen? I checked all the fuses I thought would be blown. Any help would be greatly appreciated!